<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		<select>
			<script>
				for(var i=1990; i<=2020; i++){
				document.write("<option>"+i+"</option>")
				}
			</script>
		</select>
		
		<select>
			<script>
				for(var i=1;i<=12;i++){
				document.write("<option>"+i+"</option>")
				}
			</script>
		</select>
		
			<select>
				<script>
					for(var i=1;i<=31;i++){
					document.write("<option>"+i+"</option>")
					}
				</script>
			</select>
	</body>
</html>
